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The most obvious sign is a completely dead unit. If you check your breaker panel and the circuit is live, but the HRV shows no lights on the display and doesn't respond to wall controls, the internal fuse on the motherboard may have blown, or a circuit trace has burned out.
Before blaming the motherboard, replace the wall controller (often $50–$80) and inspect the low-voltage wiring for nicks or shorts. A cheap controller failure mimics a dead motherboard 30% of the time.
The most obvious sign is a completely dead unit. If you check your breaker panel and the circuit is live, but the HRV shows no lights on the display and doesn't respond to wall controls, the internal fuse on the motherboard may have blown, or a circuit trace has burned out.
Before blaming the motherboard, replace the wall controller (often $50–$80) and inspect the low-voltage wiring for nicks or shorts. A cheap controller failure mimics a dead motherboard 30% of the time. Hrv Motherboard Replacement
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